A post with some examples: http://highscalability.com/blog/2011/1/26/google-pro-tip-use-back-of-the-envelope-calculations-to-choo.html http://highscalability.co

A post with some examples: http://highscalability.com/blog/2011/1/26/google-pro-tip-use-back-of-the-envelope-calculations-to-choo.html http://highscalability.com/blog/2011/1/26/google-pro-tip-use...